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Polyphosphazene-modified cellular polyurethane elastomer and preparation method thereof

A technology of microporous elastomer and polyurethane, applied in the field of microporous elastomer and its preparation, can solve problems such as difference in mechanical properties, and achieve the effects of improving material properties, easy preparation, and overcoming poor moisture and heat aging resistance.

Inactive Publication Date: 2014-05-21
SIZHONG NEW MATERIAL SCI & TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical properties have been improved to a certain extent, they are still far from those of the polyester type.

Method used

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  • Polyphosphazene-modified cellular polyurethane elastomer and preparation method thereof

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preparation example Construction

[0024] Preparation of polydichlorophosphazene (PDCP): Add 0.2 g calcium sulfate dihydrate, 0.2 g sulfamic acid, 15.0 g ammonium chloride, 66.0 g phosphorus pentachloride and 50 mL l,2, 4-Trichlorobenzene. Start stirring, pass cooling water, heat up to 195°C, and react for 3 hours, the system slowly turns light brown. Pour all the contents in the flask into petroleum ether, pour off the upper layer solution, add THF to dissolve the lower layer precipitate, let it stand for a few minutes, pour the upper layer liquid into the Erlenmeyer flask, add petroleum ether to precipitate, and then repeatedly purify with THF and petroleum ether 2 times, colorless PDCP was obtained.

[0025] Preparation method of linear phenoxyphosphazene oligomer with hydroxyl

[0026] Dissolve 10.00 g of PDCP in 100 mL of THF, pour it into a 500 mL one-necked flask, and then add dropwise 17.98 g of sodium phenoxide (prepared from 14.57 g of phenol and 6.20 g of sodium hydride in 100 mL of THF). Then sti...

Embodiment 1

[0045] 900g of polyethylene adipate with a molecular weight of 2000 and a functionality of 2, 100g of hydroxypolyphosphazene oligomer-1 and 306g of NDI were reacted at 128°C for 1.5 hours to obtain -NCO%=6.25%. Polymer; chain extender compounding components are: 40g 1,4-butanediol, 15g E300 (3,5-dimethylthiotoluenediamine), 9g water, 10g amine tin compound catalyst (triethylene Diamine Dabco 33-LV and dibutyltin dilaurate (T-12)), 15g of amphiphilic silicone oil DC193; using a low-pressure foaming machine, according to the ratio of isocyanic acid index to 1.08, mixed prepolymerized Body and chain extender components, the mixed glue solution is injected into a mold at 80-95°C by a low-pressure foaming machine for molding and pre-cured, demolded after 30 minutes, and then placed in a 120°C blast drying oven for 12 hours of curing.

[0046] The polyurethane microcellular elastomer prepared according to this example was aged at room temperature for about one week to test the mecha...

Embodiment 2

[0053] 930g of polyethylene adipate with a molecular weight of 2500 and a functionality of 2, 70g of hydroxyphosphazene oligomer and 303g of NDI were reacted at 128°C for 1.5 hours to obtain a prepolymer of -NCO%=6.74%; The chain extender compounding components are: 45g 1,4-butanediol, 20g E300 (3,5-dimethylthiotoluenediamine), 9g water, 10g amine tin compound catalyst (triethylene di Compounding of amine Dabco 33-LV and dibutyltin dilaurate (T-12), 15g of amphiphilic silicone oil DC193; using a low-pressure foaming machine, mix the prepolymer and For the chain extender component, the mixed glue solution is injected into a mold at 80-95°C by a low-pressure foaming machine to be formed and pre-cured. After 30 minutes, the mold is demoulded, and then placed in a blast drying oven at 120°C for 12 hours of curing.

[0054] The polyurethane microcellular elastomer prepared according to this example was aged at room temperature for about one week to test the mechanical properties an...

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Abstract

The invention discloses a polyphosphazene-modified cellular polyurethane elastomer and a preparation method thereof. The method comprises the following steps: 1, reacting excessive isocyanate and polymer polyol at the temperature of 100-150 DEG C for 30-120 minutes to generate a prepolymer of which the molecular chain end is -NCO radical; 2, performing chain extension by adopting a full-polymerization method, mixing the prepolymer and a chain extender component in the ratio of 100:(3-12), stirring at the speed of not less than 1,000 revolutions per minute for 5-30 seconds, rapidly injecting a feed liquid into a mold of which the temperature is 60-100 DEG C, pre-curing for 10-60 minutes and demolding; and 3, placing a demolded product into a drying oven of which the temperature is 80-120 DEG C, and continually curing for 6-12 hours. The cellular polyurethane elastomer prepared through the method has superior damping and buffering properties and superior moisture and aging resistance, and is mainly applied to high-strength damping elements capable of bearing dynamic fatigue in severe environments, vibration-damping and noise-reducing elements capable of bearing aging on wet-hot weather on ships and the like, as well as railway gaskets, automobile damping springs, elevator damping blocks and bridge damping blocks for use in tropical zones.

Description

[0001] technical field [0002] The invention relates to a preparation method of polyurethane microporous elastomer, especially a linear phenoxyphosphazene oligomer containing hydroxyl as polymer polyol segment, 1,5-naphthalene diisocyanate (NDI) as hard The invention relates to a microporous elastomer capable of both excellent dynamic mechanical properties and moisture-heat aging resistance and a preparation method thereof. Background technique [0003] Polyurethane microcellular elastomer has low density, excellent dynamic mechanical properties and static mechanical properties. It is a widely used industrial damping system component. Vibration and noise reduction devices and elevator safety components, etc. At present, the polyurethane microcellular elastomers used in the field of shock absorption and buffering are mainly divided into two categories: polyester polyurethane microcellular elastomers and polyether polyurethane microcellular elastomers. Polyester polyurethan...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/66C08G18/64C08G18/12C08G79/02C08G101/00C08G79/025
CPCC08G18/12C08G18/6461C08G18/664C08G18/6674C08G18/7678C08G79/025C08G2110/0083C08G18/3206C08G18/3868
Inventor 沈陈炎黄小彬
Owner SIZHONG NEW MATERIAL SCI & TECH SHANGHAI
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